Chuck



Oct. 7, 19u47. l M. sTlscHER CHUCK Filed oet. 19. 1945 JBY ATTD RN EYS Patented Oct. 7, 1/947 *UNITED )STATES t PATENT 'OFFICE CHUCK Morris Stischer, San Antonio, Tex.

Application October 19, 1943, Serial No. 506,877

3 Claims.

My invention relates to chucks, and has among its objects and advantages the provision of an improved chuck embodying nove1 structure facilitating handling of work of variable sizes.

In the accompanying drawings:

Figure 1 is a face view partly in section of a chuck in accordance with my invention.

Figure 2 is a sectional view along the line 2-2 of Figure 1, and

Figure 3 is a sectional view along the line 3-3 of Figure 1.

In the embodiment of the invention selected for illustration, I make use of a shell or frame I0, comprising two parts I2 and I4. The rear part or section I2 and the front part of section I4 are secured into a unitary structure by bolts I6. The part I2 is provided with a boss I8 having a threaded opening 20 for connection with a suitable support or for mounting in a lathe.

The sections I2 and I4 are provided with par-l allel guide ribs or faces 22 and 24 for slidably guiding an open frame or yoke 2k6. This yoke has its front side abutting the front wall 28 of the section I4, and the yoke is providedat its rear side with outwardly offset ribs 30 located between the face 32 of the section I2 and the shoulders 34 formed by offsetting the guide ribs 24 inwardly of the guide ribs 22. The lateral sides of the frame or yoke 26 contact with the inner faces of the guide ribs 22 and 24. The yoke 26 slides freely relatively to the sections I2 and I4 but is guided against lateral relative shifting.

A right hand screw 36 is threaded through the end 38 of the yoke 26. This screw is provided with an annular groove 40 located in a close tting opening 42 in the side sections I2 and I4 so that the screw is rotatably supported but restrained from relative axial movement. This screw is provided with an internally threaded bore 44 foi1 the reception of a left hand screw 46 keyed at r48 to a jaw 50 provided with teeth 52. The end 54 of the yoke 26 is also provided with teeth 55 identical with the teeth 52 and arranged in opposing relationship therewith.

My chuck is designed to afford a tight grip on pipes and the like being threaded with less slippage. Right hand rotation of the screw 3B will cause the jaws of the chuck to close, and a left hand turn will cause the jaws to move apart, the relative movement being at the same speed and the two jaws spaced equidistant from the center at al1 times. The two screws 36 and 46 have threads of the same pitch. The wall 28 is provided with a work receiving opening 58.

Without further elaboration, the foregoing will so fully explain my invention, that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

1. In a chuck of the type having a sectional annular frame, one section of which is threaded to be connected with a support for mounting in a lathe, and the other section being provided with a work receiving opening, parallel guide faces formed in the sections, a yoke slidable on the guide faces in the sections and having a jaw, a right hand operating screw threaded into the yoke and rotatably retained in the frame, said screw having an internally threaded bore to receive a left handed screw, a jaw opposing .the jaw of the yoke and keyed to the second named screw whereby said yoke and the jaw thereon and the jaw are moved in opposite directions in the same amount through rotation of the first screw.

2. In a chuck of the type described having a sectional annular frame, one section threaded to be connected with a support for mounting in a lathe, the other section provided with a work receiving opening, parallel guide faces formed in the sections on opposite sides of the work receiving opening, a yoke slidable on the guide faces in the sections and having an inner jaw face at one end thereof, a screw rotatably mounted in the frame and having a right hand threaded connection with the end of the yoke opposite the jaw face, said screw having an internally threaded bore, a left hand screw in said threaded bore, a jaw sliding in said yoke and having a jaw face facing the jaw face of the yoke and rigidly connected to the lower end of the left hand threaded screw.

3. A chuck comprising a shell provided in its front wall with a work receiving opening and on its rear wall with a screw threaded boss, the shell consisting of front and rear sections detachably connected together, parallel guide ribs Within each of the shell sections at opposite sides of the work receiving opening, the guide ribs of the front shell section extending inwardly beyond the guide ribs of the rear shell section to provide rearwardly facing shoulders, an open frame slidable within the shell with its lateral sides in contact with the guide ribs and its front side in contact with the front wall of the shell, the frame being provided at its rear side with outwardly' offset ribs contacting with the rearwardly facing shoulder and the rear wall of the shell and the guide ribs of the rear shell section, one end of the frame constituting a jaw, a second jaw slidable within the frame with relation to the irst jaw, a

3 srew fixed to and extending from the other end of the frame, a. hollow screw rotatably carried by UNITED STATES PATENTS the lateral Wall of the shell and havingscrew Number Name Date threaded engagement with said other end of the 2,100,034 Leonard Feb. 11, 1937 frame and said rst screw whereby upon oper- 5 50,593 JacksonY Oct. 24, 1865 ation to eiect the movement of the frame and 1,058,625 Y Pepper Apr. 8, 1913 movable jaw in opposite directions. Y

MORRIS STISCHER FOREIGN PATENTS y f- -f Number ,Country f f y,Date Y -REFERENCES CITED t 10 446,072 Y France sept-,22, 1911 The following references arerof recordin the :file of this patent: 

